I would suggest picking up Silman's Complete Endgame Course and How to Reassess your Chess 4th Edition
Could somebody recommend me some books for my current level?
You look slightly too weak for How to Reassess your Chess. Try the Amateur's Mind which is also by Silman first. Also keep working on your tactics. Even a 1300 player can still improve a lot by just basic tactics.
Nevermind my tactics trainer score, I did some of them massively drunk and it went down pretty quickly.
Otherwise, please do take into account my live chess standard ELO (correspondence has too few games to accurately describe my play) or just have a look at some of my games.
Thank you,
Jahleel